Spectral heterodyne tomography

Mazurenko, Yu. T.; Papayan, G. V.

doi:10.1134/1.1651253

Cited by 19 publications

(28 citation statements)

References 21 publications

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“…[2][3][4] Pump-probe measurements have demonstrated the widespread occurrence of vibrational coherence in molecular systems excited by an ultrashort laser pulse. The influence of nonequilibrium and especially coherent vibrational motion on electronic transitions has received considerable attention in theoretical studies of both time-dependent fluorescence [5][6][7][8][9][10][11] and electron transfer ͑ET͒ reactions. [12][13][14][15][16][17][18][19][20] The coherent underdamped motion on the reactant free energy surface results in a variety of subtle effects on the reaction dynamics.…”

Section: Introductionmentioning

confidence: 99%

Effect of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of donor-acceptor complexes: Stochastic simulations and experiments

Федунов

Feskov

Ivanov

et al. 2004

The Journal of Chemical Physics

111

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The influence of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of excited donor-acceptor complexes has been explored both theoretically and experimentally. The theoretical description involves the explicit treatment of both the optical formation of the nuclear wave packet on the excited free energy surface and its ensuing dynamics. The wave packet motion and the electronic transition are described within the framework of the stochastic point-transition approach. It is shown that the variation of the pulse carrier frequency within the absorption band can significantly change the effective charge recombination dynamics. The mechanism of this phenomenon is analyzed and a semiquantitative interpretation is suggested. The role of the vibrational coherence in the recombination dynamics is discussed. An experimental investigation of the ultrafast charge recombination dynamics of two donor-acceptor complexes in valeronitrile also is presented. The decays of the excited state population were found to be highly nonexponential, the degree of non-exponentiality depending on the excitation frequency. For one complex, the charge recombination dynamics was found to slow down upon increasing the excitation frequency, while the opposite behavior was observed with the other complex. These experimental observations follow qualitatively the predictions of the simulations.

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Section: Introductionmentioning

confidence: 99%

Effect of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of donor-acceptor complexes: Stochastic simulations and experiments

Федунов

Feskov

Ivanov

et al. 2004

The Journal of Chemical Physics

111

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“…Theories were first developed to describe the time-dependent fluorescence [13][14][15][16][17][18][19]. Recently different aspects of non-equilibrium effects in ultrafast ET dynamics were investigated [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

The effect of excitation pulse carrier frequency on ultrafast charge recombination dynamics of excited donor–acceptor complexes

Ivanov

Belikeev

Федунов

et al. 2003

Chemical Physics Letters

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The excitation of a charge transfer band by a laser pulse of finite duration and the ensuing charge recombination are calculated in the framework of the perturbation theory. The influence of the spectral characteristics of the laser pulse on the charge recombination dynamics is investigated for models including several nuclear modes that differ greatly in their timescales. It is shown that, in the area of applicability of the perturbation theory, the variation of the pulse carrier frequency inside the absorption band can significantly change the effective charge recombination rate constant.

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“…[7][8][9][10] The same problem was investigated, based on Shannon's information theory of communication, by the example of one possible realization of FDOCT. 5 It was shown that the information approach allows one to unite two contradictory characteristics of measurement in OCT-the speed of measurement and the quality of the images produced. In the present work, these results are generalized in such a way that it is possible to compare any realizations of TDOCT and FDOCT while using the same general relations.…”

Section: Advantages Of Fdoctmentioning

confidence: 99%

“…It can be shown that, for a weakly scattering sample, h(t) is related to the complex longitudinal image of object b z ð Þ by the equation 5,12 …”

Section: Oct Description In Terms Of Theory Of Linear Systemsmentioning

confidence: 99%

Optical coherence tomography from viewpoint of information efficiency

Mazurenko¹

2006

The Imaging Science Journal

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Optical coherence tomography (OCT) is a novel method for producing threedimensional images of weakly scattered objects, in particular, biological tissue. OCT is based on interferometry with broadband (low-coherence) light. There are two principal approaches to the realizations of OCT: time-domain OCT (TDOCT), based on scanning low-coherence interferometry; and frequency-domain OCT (FDOCT), based on spectral interferometry. The important factors characterizing OCT are the measurement speed and the quality of the images obtained. The aim of the present work is to unite these contradictory factors in terms describing the information efficiency of OCT. By analogy with Shannon's capacity of communication channels, the information capacity of measurement process is proposed. This term identifies the greatest possible amount of information produced in a unit time during the measurement process. Information capacities are determined for TDOCT and FDOCT. It is shown that the information capacity of FDOCT can be greater than that of TDOCT by a factor equal to the number of resolvable elements in a single in-depth scan of the sample investigated. Parameters characterizing the speed and image quality of TDOCT and FDOCT are also introduced and compared.

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Spectral heterodyne tomography

Cited by 19 publications

References 21 publications

Effect of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of donor-acceptor complexes: Stochastic simulations and experiments

Effect of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of donor-acceptor complexes: Stochastic simulations and experiments

The effect of excitation pulse carrier frequency on ultrafast charge recombination dynamics of excited donor–acceptor complexes

Optical coherence tomography from viewpoint of information efficiency

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